Dev Tools
Free online developer tools: format JSON/XML/SQL, decode Base64/JWT, generate hashes, convert cURL, and more.
Base64 Encoder/Decoder
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Bcrypt Hash Generator
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Code Minifier
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Color Contrast Checker
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Color Picker
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Cron Generator
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CSS Box Shadow Generator
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CSS Gradient Generator
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CSV to JSON Converter
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cURL Converter
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Hash Generator
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.htaccess Generator
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HTML Entity Encoder
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JSON Formatter
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JWT Decoder
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Meta Tag Generator
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Regex Tester
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Robots.txt Generator
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SQL Formatter
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String Escaper
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Timestamp Converter
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URL Encoder/Decoder
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XML Formatter
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YAML to JSON Converter
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Free Online Developer Tools
Developer tools that live in the browser save the context-switching of opening a terminal or installing a package for a one-off task. Format a JSON response, decode a Base64 string, inspect a JWT, generate a hash, or encode a URL — all without leaving the page you're working on.
Every tool processes data client-side. Sensitive tokens, passwords, and API keys are never sent to a server.
Which developer tool should I use?
| I want to… | Use this tool |
|---|---|
| Pretty-print or validate JSON | JSON Formatter |
| Encode or decode Base64 | Base64 Encoder/Decoder |
| Encode or decode URL characters | URL Encoder/Decoder |
| Escape or unescape HTML entities | HTML Entity Encoder |
| Escape strings for JSON, regex, or SQL | String Escape Tool |
| Convert a Unix timestamp to a date | Timestamp Converter |
| Test or debug a regex pattern | Regex Tester |
| Decode a JWT and inspect its claims | JWT Decoder |
| Generate MD5, SHA-256, or SHA-512 hashes | Hash Generator |
| Hash a password with bcrypt | Bcrypt Hash Generator |
| Build or look up a cron expression | Cron Generator |
| Format or beautify SQL queries | SQL Formatter |
| Format and validate XML | XML Formatter |
| Convert YAML to JSON or back | YAML ↔ JSON Converter |
| Convert CSV to JSON or back | CSV ↔ JSON Converter |
| Convert a curl command to code | cURL Converter |
| Minify or beautify HTML, CSS, or JS | Code Minifier |
| Pick a color and generate a palette | Color Picker |
| Check color contrast for WCAG accessibility | Color Contrast Checker |
| Generate a CSS gradient | CSS Gradient Generator |
| Generate a CSS box-shadow | CSS Box Shadow Generator |
| Generate Apache redirect rules | .htaccess Generator |
| Generate meta tags and Open Graph tags | Meta Tag Generator |
| Build a robots.txt file | Robots.txt Generator |